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Wells, Robert E. What's Faster than a Speeding Cheetah? Morton Grove, IL: A. Whitman, 1997. Print.

Layton, Julian. "HowStuffWorks "How Does Gravity Work?"" HowStuffWorks "Science" Web. 03 Feb. 2012. <http://science.howstuffworks.com/environmental/earth/geophysics/question232.htm>
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